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bobcat 225nt fuel pump problems help please

09-01-2012, 02:41 PM

I think the fuel pump is intermediatly going out. It will run 5- 10 min them die. Fuel filter just changed. And stays mostly empty of fuel. Checkef the fuel tanks straw and look good no damage. How do I make sure its the fuel pump and not something else and would any Aftermarket electric fuel pump work?

Specs on the pulsating diaphragm Onan fuel pump are minimum 2.6" mercury suction and 1.7psi discharge at 5 seconds low and high idle with gauges connected directly to and at the same elevation as the fuel pump.

Comment

I think the fuel pump is intermediatly going out. It will run 5- 10 min them die. Fuel filter just changed. And stays mostly empty of fuel. Checkef the fuel tanks straw and look good no damage. How do I make sure its the fuel pump and not something else and would any Aftermarket electric fuel pump work?

The same exact thing happened to my 225 NT. I could put a bit of fuel down the carb and it would run a bit and quit. I purchased an aftermarket pump for $20 and problem solved. I tried new fuel lines and a new fuel filter first but it wound up being the pump.
Nick

Also check the condition of the pulse hose that goes between the vent tube on the timeing gear cover to the back of the fuel pump. If this hose has been softened by the oil vapors and is a loose fit, the pulse signal that makes the fuel pump work will be weak at best.